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41. 发明授权

US07416794B2 Magnetic recording medium, method for manufacturing recording medium and magnetic recording apparatus 有权
标题翻译：磁记录介质，记录介质的制造方法和磁记录装置
公开(公告)号：US07416794B2
公开(公告)日：2008-08-26
申请号：US11080487
申请日：2005-03-16
申请人： Tomoyuki Maeda , Akira Kikitsu , Soichi Oikawa , Takeshi Iwasaki
发明人： Tomoyuki Maeda , Akira Kikitsu , Soichi Oikawa , Takeshi Iwasaki
IPC分类号： G11B5/66
CPC分类号： G11B5/667 , G11B5/65 , G11B5/7325
摘要： A magnetic recording layer is formed on an under-layer comprising a Cu crystalline grain layer and a deposited nitrogen atom layer on the Cu crystalline grain layer surface. Then the magnetic recording layer comprising very small average grain diameter and sharp grain diameter distribution is obtained. The magnetic recording medium comprising the magnetic recording layer shows excellent signal to noise ratio at high density recording.
摘要翻译：在Cu晶粒层表面上的包含Cu晶粒层和沉积的氮原子层的下层上形成磁记录层。然后获得包含非常小的平均粒径和尖锐的粒径分布的磁记录层。包括磁记录层的磁记录介质在高密度记录时显示出优异的信噪比。

42. 发明申请

US20060269794A1 Perpendicular magnetic recording medium and perpendicular magnetic recording/reproducing apparatus 有权
标题翻译：垂直磁记录介质和垂直磁记录/再现装置
公开(公告)号：US20060269794A1
公开(公告)日：2006-11-30
申请号：US11441184
申请日：2006-05-26
申请人： Soichi Oikawa
发明人： Soichi Oikawa
IPC分类号： G11B5/66
CPC分类号： G11B5/7325 , G11B5/8404
摘要： In a perpendicular magnetic recording medium, a multilayered underlayer including a first metal underlayer, a second metal underlayer having no solid solution properties with respect to the first metal underlayer and having a hole, and a third metal underlayer having solid solution properties with respect to the first metal underlayer and having no solid solution properties with respect to the second metal underlayer is formed on a substrate, and a magnetic recording layer is formed on the multilayered underlayer.
摘要翻译：在垂直磁记录介质中，包括第一金属底层的多层底层，相对于第一金属底层没有固溶性质的具有孔的第二金属底层和相对于第一金属底层具有固溶性质的第三金属底层在基板上形成第一金属底层并且在第二金属底层上没有固溶性，并且在多层底层上形成磁记录层。

43. 发明授权

US08064244B2 Thin seeded Co/Ni multilayer film with perpendicular anisotropy for spintronic device applications 有权
标题翻译：用于自旋电子器件应用的具有垂直各向异性的薄种子Co / Ni多层膜
公开(公告)号：US08064244B2
公开(公告)日：2011-11-22
申请号：US12456621
申请日：2009-06-19
申请人： Kunliang Zhang , Min Li , Yuchen Zhou , Soichi Oikawa , Kenichiro Yamada , Katsuhiko Koui
发明人： Kunliang Zhang , Min Li , Yuchen Zhou , Soichi Oikawa , Kenichiro Yamada , Katsuhiko Koui
IPC分类号： G11C11/00
CPC分类号： G01R33/098 , G01R33/1284 , G11C11/161 , H01L43/08 , H01L43/10 , Y10T29/49032 , Y10T29/49043 , Y10T29/49044 , Y10T29/49046 , Y10T29/49048 , Y10T29/49052 , Y10T428/1107 , Y10T428/1114 , Y10T428/1121 , Y10T428/1129 , Y10T428/1136 , Y10T428/1143
摘要： A spin valve structure for a spintronic device is disclosed and includes a composite seed layer made of at least Ta and a metal layer having a fcc(111) or hcp(001) texture to enhance perpendicular magnetic anisotropy (PMA) in an overlying (Co/Ni)x multilayer. The (Co/Ni)x multilayer is deposited by a low power and high Ar pressure process to avoid damaging Co/Ni interfaces and thereby preserving PMA. As a result, only a thin seed layer is required. PMA is maintained even after annealing at 220° C. for 10 hours. Examples of GMR and TMR spin valves are described and may be incorporated in spin transfer oscillators and spin transfer MRAMs. The free layer is preferably made of a FeCo alloy including at least one of Al, Ge, Si, Ga, B, C, Se, Sn, or a Heusler alloy, or a half Heusler alloy to provide high spin polarization and a low magnetic damping coefficient.
摘要翻译：公开了一种用于自旋电子器件的自旋阀结构，并且包括至少由Ta制成的复合种子层和具有fcc（111）或hcp（001）织构的金属层，以增强覆盖层（Co）中的垂直磁各向异性（PMA） / Ni）x多层。（Co / Ni）x多层通过低功率和高Ar压力工艺沉积，以避免损坏Co / Ni界面，从而保留PMA。结果，仅需要薄的种子层。即使在220℃退火10小时后也保持PMA。描述了GMR和TMR自旋阀的实例，并且可以结合在自旋转移振荡器和自旋转移MRAM中。自由层优选由包括Al，Ge，Si，Ga，B，C，Se，Sn或Heusler合金或Heusler合金中的至少一种的FeCo合金制成，以提供高自旋极化和低磁性阻尼系数。

44. 发明申请

US20100142088A1 Spin torque oscillator, magnetic recording head, magnetic head assembly and magnetic recording apparatus 失效
标题翻译：旋转扭矩振荡器，磁记录头，磁头组件和磁记录装置
公开(公告)号：US20100142088A1
公开(公告)日：2010-06-10
申请号：US12588176
申请日：2009-10-06
申请人： Hitoshi Iwasaki , Soichi Oikawa , Katsuhiko Koui , Kenichiro Yamada
发明人： Hitoshi Iwasaki , Soichi Oikawa , Katsuhiko Koui , Kenichiro Yamada
IPC分类号： G11B5/127
CPC分类号： G11B5/3146 , G11B5/314 , G11B2005/0005 , G11B2005/0024 , G11C11/161 , G11C11/1673 , G11C11/1675 , H01L43/08 , H03B15/006
摘要： A spin torque oscillator includes an amorphous soft magnetic layer, a nonmagnetic layer and a hard magnetic layer. The nonmagnetic layer with a close-packed crystal structure is provided on the amorphous soft magnetic layer. The hard magnetic layer with a close-packed crystal structure and perpendicular magnetic anisotropy is provided on the nonmagnetic layer.
摘要翻译：自旋转矩振荡器包括非晶软磁层，非磁性层和硬磁层。在非晶软磁层上提供具有紧密结晶结构的非磁性层。在非磁性层上提供具有紧密堆积晶体结构和垂直磁各向异性的硬磁性层。

45. 发明申请

US20100007996A1 Magnetic head assembly and magnetic recording/reproducing apparatus 有权
标题翻译：磁头组件和磁记录/重放装置
公开(公告)号：US20100007996A1
公开(公告)日：2010-01-14
申请号：US12457657
申请日：2009-06-17
申请人： Hitoshi Iwasaki , Kenichiro Yamada , Masayuki Takagishi , Tomomi Funayama , Masahiro Takashita , Mariko Shimizu , Soichi Oikawa , Katsuhiko Koui
发明人： Hitoshi Iwasaki , Kenichiro Yamada , Masayuki Takagishi , Tomomi Funayama , Masahiro Takashita , Mariko Shimizu , Soichi Oikawa , Katsuhiko Koui
IPC分类号： G11B5/33
CPC分类号： B82Y10/00 , B82Y25/00 , G11B5/3906 , G11B2005/0005 , G11B2005/3996
摘要： It is made possible to reduce the write magnetic field generated from the main magnetic pole toward the spin torque oscillator, so as to reduce the variation in the oscillation characteristics of the spin torque oscillator, and reduce the current required for oscillation. The magnetic head assembly includes: a recording magnetic pole; a spin torque oscillator that has first and second magnetic layers, and an intermediate layer interposed between the first and second magnetic layers, the spin torque oscillator generating a high-frequency magnetic field by applying a current between the first and second magnetic layers; and a third magnetic layer that is placed adjacent to at least part of a side face of the second magnetic layer.
摘要翻译：可以将从主磁极产生的写入磁场减小到自旋转矩振荡器，从而减小自旋转矩振荡器的振荡特性的变化，并且降低振荡所需的电流。磁头组件包括：记录磁极; 旋转扭矩振荡器，其具有第一和第二磁性层，以及介于所述第一和第二磁性层之间的中间层，所述自旋扭矩振荡器通过在所述第一和第二磁性层之间施加电流而产生高频磁场; 以及与第二磁性层的侧面的至少一部分相邻配置的第三磁性层。

46. 发明申请

US20050214520A1 Granular thin film, perpendicular magnetic recording medium employing granular thin film and magnetic recording apparatus 审中-公开
标题翻译：颗粒状薄膜，采用粒状薄膜的垂直磁记录介质和磁记录装置
公开(公告)号：US20050214520A1
公开(公告)日：2005-09-29
申请号：US11079190
申请日：2005-03-15
申请人： Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Akira Kikitsu
发明人： Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Akira Kikitsu
IPC分类号： G11B5/667 , B32B5/16 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/84 , H01F10/00
CPC分类号： B82Y25/00 , G11B5/656 , G11B5/667 , G11B5/7325 , H01F10/007 , Y10T428/25
摘要： A perpendicular magnetic recording medium suitable for attaining a low noise high magnetic recording density is obtained. The medium has a small average magnetic grain diameter, a small magnetic grain diameter distribution, a high perpendicular crystallographic magnetic grain orientation and a high regularity magnetic grain arrangement. The perpendicular magnetic recording medium comprises a soft magnetic layer, a granular under-layer and a perpendicular magnetic recording layer on a substrate. The granular under-layer is formed on a metal under-layer. The metal grains in the granular layer are separated by nonmagnetic inter-grain material and are partially penetrated into the metal under-layer. The perpendicular magnetic recording layer is formed on the granular layer. Then a perpendicular magnetic recording medium shows high signal to noise ratio and excellent high-density recording characteristics.
摘要翻译：获得适于获得低噪声高磁记录密度的垂直磁记录介质。该介质具有小的平均磁晶粒直径，小的磁晶粒直径分布，高垂直晶体磁晶粒取向和高规则磁晶粒排列。垂直磁记录介质包括在基底上的软磁性层，颗粒底层和垂直磁记录层。颗粒状底层形成在金属底层上。颗粒层中的金属颗粒被非磁性颗粒间材料分离，并部分渗入金属底层。垂直磁记录层形成在粒状层上。然后垂直磁记录介质显示出高的信噪比和优异的高密度记录特性。

47. 发明申请

US20050117250A1 Magnetic recording head, head suspension assembly, magnetic recording apparatus, composite head, and magnetic recording and reproducing apparatus 审中-公开
标题翻译：磁记录头，磁头悬挂组件，磁记录装置，复合磁头和磁记录和重放装置
公开(公告)号：US20050117250A1
公开(公告)日：2005-06-02
申请号：US10943225
申请日：2004-09-17
申请人： Soichi Oikawa
发明人： Soichi Oikawa
IPC分类号： G11B5/31 , G11B5/127 , G11B5/187 , G11B5/48
CPC分类号： G11B5/1278
摘要： A magnetic recording head which records information on a recording medium by a vertical magnetic recording method, the magnetic recording head comprises a magnetic pole piece which generates a recording magnetic flux perpendicular to the recording surface of a recording medium and which includes a side parallel to the track width direction of the recording medium, and a concave part which is made concavely in the side parallel to the track width direction of the recording medium so as to have a longitudinal direction parallel to the recording surface, with the length of the magnetic pole piece in the track width direction of the recording medium being equal to 0.3 micrometers or less.
摘要翻译：一种磁记录头，其通过垂直磁记录方法将信息记录在记录介质上，磁记录头包括磁极片，该磁极片产生垂直于记录介质的记录表面的记录磁通量，该磁极片包括与记录介质的轨道宽度方向，以及在与记录介质的轨道宽度方向平行的方向上凹入地形成为具有与记录表面平行的纵向方向的凹形部分，磁极片的长度在记录介质的轨道宽度方向上等于0.3微米或更小。

48. 发明授权

US08877360B2 Magnetic recording medium with a plurality of pinning portions in the magnetic layer 有权
标题翻译：在磁性层中具有多个钉扎部分的磁记录介质
公开(公告)号：US08877360B2
公开(公告)日：2014-11-04
申请号：US13303479
申请日：2011-11-23
申请人： Soichi Oikawa
发明人： Soichi Oikawa
IPC分类号： G11B5/673 , G11B5/73 , G11B5/65 , G11B5/66
CPC分类号： G11B5/65 , G11B5/66 , G11B5/7325
摘要： According to one embodiment, a perpendicular magnetic recording medium includes a substrate, and a multilayered magnetic recording layer formed on the substrate by alternately stacking two or more magnetic layers and two or more nonmagnetic layers. The magnetic layers and nonmagnetic layers of the multilayered magnetic recording layer are continuous layers. The magnetic layer includes a magnetic material portion, and a plurality of pinning sites dispersed in the magnetic material portion and made of a nonmagnetic metal different from a nonmagnetic material as a main component of the nonmagnetic layer. This perpendicular magnetic recording medium has magnetic characteristics by which a gradient α of a magnetization curve near the coercive force is 5 or more.
摘要翻译：根据一个实施例，垂直磁记录介质包括通过交替堆叠两个或更多个磁性层和两个或更多个非磁性层而形成在衬底上的衬底和多层磁记录层。多层磁记录层的磁性层和非磁性层是连续层。磁性层包括磁性材料部分和分散在磁性材料部分中并由不同于非磁性材料的非磁性材料制成的多个钉扎部位作为非磁性层的主要成分。该垂直磁记录介质具有磁矫顽力附近的磁化曲线的梯度α为5以上的磁特性。

49. 发明授权

US08786973B2 Thermally assisted magnetic recording medium and thermally assisted magnetic recording apparatus 有权
标题翻译：热辅助磁记录介质和热辅助磁记录装置
公开(公告)号：US08786973B2
公开(公告)日：2014-07-22
申请号：US13597042
申请日：2012-08-28
申请人： Soichi Oikawa
发明人： Soichi Oikawa
IPC分类号： G11B5/02
CPC分类号： G11B5/1278 , G11B2005/0021
摘要： According to one embodiment, a thermally assisted magnetic recording method performs heating at a temperature higher than the ambient temperature of the perpendicular recording medium and lower than a temperature at which a nucleation magnetic field Hn of the recording portion is 0, decreases a coercive force Hc of a recording portion by heating a perpendicular recording medium, and records magnetic information by applying a recording magnetic field from a recording magnetic pole to the recording portion having the decreased coercive force.
摘要翻译：根据一个实施例，热辅助磁记录方法在高于垂直记录介质的环境温度的温度下进行加热，并且低于记录部分的成核磁场Hn为0的温度，降低矫顽力Hc 通过加热垂直记录介质来记录记录部分，并通过将记录磁场从记录磁极施加到具有降低的矫顽力的记录部分来记录磁信息。

50. 发明授权

US08748017B2 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US08748017B2
公开(公告)日：2014-06-10
申请号：US13175358
申请日：2011-07-01
申请人： Masatoshi Sakurai , Yousuke Isowaki , Soichi Oikawa
发明人： Masatoshi Sakurai , Yousuke Isowaki , Soichi Oikawa
IPC分类号： G11B5/66
CPC分类号： G11B5/855 , B82Y10/00 , G11B5/746 , G11B5/82
摘要： According to one embodiment, a bit patterned medium includes a substrate, and a magnetic recording layer disposed above the substrate and including patterns of protrusions. Each of the protrusions contains a plurality of crystal grains. An average distance between the crystal grains is 0.5 to 3.0 nm in each of the protrusions. The protrusions include first protrusions each having a length of 1 μm or more in a radial direction of the medium and second protrusions each having a length in the radial direction shorter than the length of the first protrusion in the radial direction. Each of the first protrusions has a nucleation field Hn for magnetization reversal and a coercive force Hc satisfying the inequalities, Hn≧1.5 kOe and 0.5 kOe≦Hc−Hn≦1.5 kOe.
摘要翻译：根据一个实施例，位图案化介质包括衬底和设置在衬底上方并包括突起图案的磁记录层。每个突起包含多个晶粒。每个突起中晶粒之间的平均距离为0.5至3.0nm。突起包括在介质的径向上具有1μm以上的长度的第一突起和在径向上的长度比第一突起的径向的长度短的第二突起。每个第一突起具有用于磁化反转的成核磁场Hn和满足不等式Hn≥1.5kOe和0.5kOe＆amp; NlE; Hc-Hn＆nlE; 1.5kOe的矫顽力Hc。

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